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contributing.md

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+# Contributing to cipherstorm
+
+Short version: keep it useful, keep it tidy, keep it classy (ish).
+
+## What to add
+- **Resources** (books, papers, labs, writeups) → add to `README.md`
+- **Tools** (frameworks, utilities, wordlists) → add to `tools.md`
+- Prefer official sources. Use 📖 for free / 📕 for paid.
+- Alphabetize within each section. One-line, factual descriptions.
+
+## What not to add
+- Dead links, paywalled mirrors, shady re-hosts.
+- Duplicates or personal promo dumps.
+
+## Style
+- Sentence case, end with a period.
+- No hype, no filler. (“Solid intro to X,” not “ultimate best most insane.”)
+- Keep the NoirStack tone: dry, pointed, helpful.
+
+## How to submit
+1. Branch from `main`.
+2. Edit the right file(s).
+3. `git commit -m "Add: <name> — <one-liner>"`
+4. Open a PR with a quick rationale.
+
+## Credit
+Contributors are legends. Add yourself to the PR; we’ll keep the list tidy.